Combined seat and backrest for a chair



FIG. 1 is a side elevational view of a combined seat and backrest for a chair showing my design;

FIG. 2 is a front elevational view of a combined seat and backrest for a chair of FIG. 1;

FIG. 3 is a rear elevational view of a combined seat and backrest for a chair of FIG. 1;

FIG. 4 is a top plan view thereof.

The side of the combined seat and backrest not shown is a mirror image of the side shown in FIG. 1. 

The ornamental design for a combined seat and backrest for a chair, as shown and described. 